Convert Square inches per hour to Square feet per hour
Convert Square inches per hour (in²/h) to Square feet per hour (ft²/h) instantly and accurately.
Conversion Formula
ft²/h = in²/h × 0.006944444444
About Square inches per hour
The square inch per hour (in²/h) equals ≈1.792 × 10⁻⁷ m²/s, used in US heat-transfer handbooks and HVAC insulation specifications. Pre-SI tables for building insulation board and refractory brick often list thermal diffusivity in in²/h. Firebrick: ≈3.5 in²/h; rigid foam: ≈0.8-1.2 in²/h. 1 in²/h = 0.00064516/3600 m²/s.
About Square feet per hour
The square foot per hour (ft²/h) equals ≈2.581 × 10⁻⁵ m²/s and is the dominant unit in US engineering practice for thermal diffusivity of building materials and industrial insulation. ASHRAE handbooks, Perry's Chemical Engineers' Handbook, and NFPA fire-resistance tables all list diffusivity in ft²/h. Steel: ≈0.4-0.5 ft²/h; concrete: ≈0.023 ft²/h; mineral wool: ≈0.005 ft²/h. 1 ft²/h = 0.09290304/3600 m²/s.
Quick Reference Table
| Square inches per hour (in²/h) | Square feet per hour (ft²/h) |
|---|---|
| 1 in²/h | 0.00694444 ft²/h |
| 2 in²/h | 0.0138889 ft²/h |
| 5 in²/h | 0.0347222 ft²/h |
| 10 in²/h | 0.0694444 ft²/h |
| 25 in²/h | 0.173611 ft²/h |
| 50 in²/h | 0.347222 ft²/h |
| 100 in²/h | 0.694444 ft²/h |